/*
 *    Copyright 2011-2012 The Hook Team
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.hook.yaksha.utils;

import java.util.concurrent.atomic.AtomicLong;

/**
 * 简单的一个实现，防止日志爆掉
 * 
 * @author suwuqiang 2011-12-29
 */
public class Threshold {
	private AtomicLong lastTimeStamp;
	private long frequency;

	public Threshold(long frequency) {
		this.frequency = frequency;
		this.lastTimeStamp = new AtomicLong(System.currentTimeMillis());
	}

	public boolean sholdBlock() {
		long now = System.currentTimeMillis();
		long interval = now - lastTimeStamp.get();
		if (interval > frequency) {
			lastTimeStamp.set(now); // 这里不用并发原语
			return false;
		} else {
			return true;
		}
	}
}
